Engine
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| Engine options | |
| Engine | John Deere 6.6L 6-cyl diesel John Deere 5.6L 6-cyl gasoline John Deere 5.9L 6-cyl gasoline John Deere 5.9L 6-cyl LP gas |
| Engine Detail | |
| Engine | John Deere |
| Fuel | diesel |
| Cylinders / valves | 6-cylinder 12-valve |
| Cooling / layout | liquid-cooled inline |
| Engine application | Oil capacity on most 4020 diesels increased from 8 to 12 quarts starting with the 1969 model year, tractor serial number 201,000. High-crop diesel tractors retained the 8-quart capacity throughout the production run. Tractors fitted with after-market turbochargers, and early tractors with replacement oil pans, may also have the higher oil capacity. |
| Displacement | 404 ci 6.6 L |
| Bore/Stroke | 4.25x4.75 inches 108 x 121 mm |
| Compression | 16.5:1 |
| Rated RPM | 2200 |
| Idle RPM | 600-2500 |
| Operating RPM | 1500-2200 |
| Firing order | 1-5-3-6-2-4 |
| Starter volts | 24 |
| Coolant capacity | 24 qts 22.7 L |
| Intake valve clearance | 0.018 inches 0.457 mm |
| Exhaust valve clearance | 0.018 inches 0.457 mm |
| Engine Oil | |
| Early Oil capacity | 8 qts 7.6 L |
| Late Oil capacity | 12 qts 11.4 L |
| Engine Detail | |
| Engine | John Deere |
| Fuel | gasoline |
| Cylinders / valves | 6-cylinder 12-valve |
| Cooling / layout | liquid-cooled inline |
| Fuel | Original gasoline and LP-gas engine, used through the 1965 model year. |
| Displacement | 340 ci 5.6 L |
| Bore/Stroke | 4.25x4.00 inches 108 x 102 mm |
| Compression | 7.5:1 |
| Rated RPM | 2200 |
| Idle RPM | 650-2500 |
| Operating RPM | 1500-2200 |
| Firing order | 1-5-3-6-2-4 |
| Starter volts | 12 |
| Coolant capacity | 24 qts 22.7 L |
| Sparkplug gap | 0.025 inches 0.635 mm |
| Point gap | 0.016 inches 0.406 mm |
| Intake valve clearance | 0.015 inches 0.381 mm |
| Exhaust valve clearance | 0.028 inches 0.711 mm |
| Engine Oil | |
| Oil capacity | 9 qts 8.5 L |
| Engine Detail | |
| Engine | John Deere |
| Fuel | gasoline |
| Cylinders / valves | 6-cylinder 12-valve |
| Cooling / layout | liquid-cooled inline |
| Notes | The larger, 362 ci engine became available in 1966, replacing 340 ci engine. |
| Displacement | 362 ci 5.9 L |
| Bore/Stroke | 4.25x4.25 inches 108 x 108 mm |
| Compression | 7.5:1 |
| Rated RPM | 2200 |
| Firing order | 1-5-3-6-2-4 |
| Starter volts | 12 |
| Oil capacity | 8 qts 7.6 L |
| Coolant capacity | 24 qts 22.7 L |
| Engine Detail | |
| Engine | John Deere |
| Fuel | LP gas |
| Cylinders / valves | 6-cylinder 12-valve |
| Cooling / layout | liquid-cooled inline |
| Displacement | 362 ci 5.9 L |
| Bore/Stroke | 4.25x4.25 inches 108 x 108 mm |
| Compression | 9.0:1 |
| Rated RPM | 2200 |
| Firing order | 1-5-3-6-2-4 |
| Starter volts | 12 |
| Oil capacity | 8 qts 7.6 L |
| Coolant capacity | 24 qts 22.7 L |
Values may vary by engine, transmission or configuration. View source page